Reply To: Etz 251 gearing › Forums › Technical › Two Stroke: Hints and Tips › Etz 251 gearing › Reply To: Etz 251 gearing February 21, 2025 at 10:01 pm #17206 Rob HoluszaParticipant 21t sprocket works absolutely fine in a stock bike, these engines have to revved, and it’s zero harm to them.
